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TIL that it took Boeing less than 3 years from starting the 747 project to first flight. The first commercial flight occurred 11 months later.

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X0vgR TIL in 1970 one monkey's head was transplanted to the headless body of another monkey. Although the monkey was now paralyzed from neck down, they could still hear, smell, taste, eat and follow objects with its eyes. Died in 9 days because of immune rejection.
D17kp TIL Walt Disney World near Orlando briefly had a real airport with a singing runway. Grooves in the tarmac were spaced so the lines played the opening notes of "When You Wish Upon a Star" when planes rolled over them. The airport closed in 1972.
GYwA5 TIL in 1709, a colonial delegation brought four Indians to London—three Mohawks and a Mahican—and presented them in London as the “Four Indian Kings” of the Iroquois. The four kings met Queen Anne, dined with nobility, attended the theater, and toured the sites.
VMlWD TIL of Edward Katskee, a scientist who accidentally overdosed on Cocaine after he purposefully injected himself with a large dose of to test how it affected the human body. He attempted to write notes on the walls of his office as he died. They were deemed too illegible to be scientifically useful.
Wkr19 TIL that in the 1940s, the USSR had a program designed to study the excrement of foreign leaders. It was believed that traces of various compounds in feces could give insights into each leader's psychology.